Fractions: Multiplication Test Review

Fractions: Multiplication Test Review

Test on Friday 2/26

What should you know for the test:

• Multiply fractions by fractions

• Multiply fractions by whole numbers

• Multiply fractions by mixed numbers

• Rename mixed numbers as improper fractions

• Your answers should always be simplified in lowest terms!

Multiple Choice

DON'T FORGET:

To find a fraction OF a fraction you:

• Add

• Subtract

• Multiply

• Divide

Don't forget to simplify before you multiply!

Find the Greatest Common Factor in order to simplify.

When using models to multiply look at the double-shaded area!

Consider the new numerator and new denominator.

Open Ended

Use the model to solve: $\frac{1}{2}\times\frac{3}{4}$  

Open Ended

Use the model to solve: $\frac{2}{3}\times\frac{3}{4}$  

Open Ended

Use the model to solve: $\frac{1}{3}\times\frac{1}{4}$  

To Multiply a Fraction by a Fraction

• Simplify first by looking for greatest common factors.

• Multiply across the numerators.

• Multiply across the denominators.

Open Ended

 $\frac{2}{3}\times\frac{6}{7}$  

To Multiply a Fraction by a Whole Number

• Remember that all whole numbers have an invisible denominator of 1

• Simplify by pulling out any GCF's

• Multiply across the numerators and across the denominators

Open Ended

 $4\times\frac{2}{7}$  

Multiple Choice

Rename as an improper fraction: $3\ \frac{4}{5}$  

•  $\frac{12}{5}$  

•  $\frac{9}{3}$  

•  $\frac{20}{3}$  

•  $\frac{19}{5}$  

To Multiply a Fraction by a Mixed Number

• Rename the mixed number as an improper fraction

• Simplify by pulling out any GCF's

• Multiply across the numerators and across the denominators

Open Ended

 $1\ \frac{1}{3}\times\frac{1}{2}$  

Multiple Choice

A recipe makes 12 cookies. Jenna multiplies the recipe by

 $\frac{2}{5}$  .  Will Jenna end up making more than 12 cookies or less than 12 cookies?

• more than 12

• less than 12

Open Ended

A rectangle has a length of

 $1\ \frac{2}{3}$  feet and a width of  $\frac{3}{4}$  feet.  Multiply the length  $\times$  the width to find the area. 

Multiple Select

Select all of the equivalent fractions that can be simplified from $\frac{50}{100}$  

•  $\frac{2}{50}$  

•  $\frac{25}{50}$  

•  $\frac{1}{2}$  

•  $\frac{50}{10}$  

•  $\frac{5}{10}$